Library of Windows 8 is wonderful as compared to other low versions of windows. It gives a clean user interface to manage your data according to the type. If you get errors like these :

• Pictures.library-Ms is No Longer Working
• Documents.library-Ms is No Longer Working
• Videos.library-Ms is No Longer Working
• Music.library-Ms is No Longer Working

then its because something had crashed while you were trying to modify your data using Libraries. Its a very rare issue actually and was seen in Windows 7 too for some people but for me, I got this error on Windows 8. Well I just checked & got the solution — Its simple!

1. Open Computer or Windows Explorer
2. Just see whether which all libraries are giving these error.
3. Right-click the libraries in the sidebar and select Delete. (Don’t Panic — It won’t delete your files!)
4. Right-click the “Libraries” folder in the sidebar and select Restore Default Libraries.

Well, that was quick right? It’s a very rare bug in Windows 😉